It's obvious this refers to document conferring exclusive right (6)

I believe the answer is:

patent

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'it's obvious' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

(Other definitions for patent that I've seen before include "licence inside" , "Copyright" , "For all to see" , "unmistakeable" , "Obvious - property right to invention" .)

I've seen this clue in The Irish Times.

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